作者：Hua Lei, Chen Qixian, Yin Jing, Zhang Chunqiu, Xiaoli Wang, Feng Xin, Yang Jinjun
关键字：fabrication; graphene; poly(ε-caprolactone); property
论文来源：期刊
具体来源：Macromolecular Materials and Engineering
发表时间：2017年

A chemical strategy is attempted to modify graphene for its facilitated dispersion in

poly(ε-caprolactone) (PCL) matrix. Herein, graphite oxide is subjected to sequential treatment

with phenyl isocyanate and vitamin C (VC) to yield graphene nanosheets (iG-VC). It is noteworthy

that following the reduction treatment, iG-VC graphene sheets exfoliate within the PCL matrix

and show appreciable interfacial compatibility with PCL matrix in organic solvent by virtue of

improved polarity from isocyanate treatment. The tensile yield strength and Young''''''''s modulus of

the PCL/iG-VC composite exhibit pronounced enhancement as compared to neat PCL, despite of

mere composition of graphene sheets. The tensile yield stress of composite is increased notably

to reach 18.6 MPa at 3 wt% graphene sheets as compared to neat PCL. Likewise, Young''''''''s modulus

of composite is observed to increase from 370 to 470 MPa at

5 wt% graphene sheets. Moreover, the crystallization temperature

(Tc) and crystallinity of PCL increase significantly upon

incorporation of small amount of iG-VC. Ultimately, functional

role of iG-VC graphene sheets is demonstrated in enhancing

electrical conductivity of PCL-based nanocomposites. The plausible

mechanisms are also proposed to explain the increased

Tc, improved mechanical property, and improved electrical

conductivity of PCL/iG-VC composite.